without this change, slurmd would abort on reconfiguration

Prevent fatal error on "scontrol reconfig"

when a job runs to completion.

With this commit, the slurm controller will now initialize the configured
layouts and parse their configuration files at startup.

Note that even if no layouts were configured, a "base" layout is
automatically built in slurm-layouts_load_config(). This "base" layout is
containing every nodes defined in the system, linked together as a flat tree.

(Adapted for slurm-14.11 by Matthieu Hautreux <matthieu.hautreux@cea.fr>)

This commit introduces the entity, layout and layouts manager related structures
corresponding to the core of the layouts logic.

The layouts manager is responsible for initializing and loading the layouts
specified in the slurm.conf "Layouts=" pragma retrieved using
slurm_get_layouts().

(Adapted for slurm-14.11 by Matthieu Hautreux <matthieu.hautreux@cea.fr>)

This new pragma will be used to define the list of layouts to load at startup.
It will consist of comma separated values of layouts type and optional names,
respecting the following pattern : Layouts=layout_type[/layout_name][,...]
In case the name would not be defined, "default" would be assumed.

(Adapted for slurm-14.11 by Matthieu Hautreux <matthieu.hautreux@cea.fr>)

Apply freefunc on the node and no longer its internal data in xtree_free
Add XTREE_GROWING xtree_walk target to ease building a tree adding childs
while walking it

(Adapted for slurm-14.11 by Matthieu Hautreux <matthieu.hautreux@cea.fr>)

Current slurm parser is mostly dedicated to manage key=value entries in a
configuration file, providing the capability to manage more complex
configuration lines like "key=value attr1=val1 attr2=val2 ..." through the
implementation of custom handlers.

However, custom handlers often had to rewrite their own parsing logic in
order to handle the various subcomponents/attributes.

This commit enhances the parsing logic in order to ease the management of
complex lines using nested parsing options definitions, automatic expansions of
array-like attributes and automatic merges of related lines.

These enhancements are the basis of the layouts configurations parsing logic

(Adapted for slurm-14.11 by Matthieu Hautreux <matthieu.hautreux@cea.fr>)

Improve scheduling of jobs in reservations that overlaps other reservations.
bug 1051

had --network= specified.

ProfileHDF5Dir directory as well as all it's sub-directories and files.

This isn't the case in the current code so this isn't as big of a deal.

This logic will also be removed in 14.11 so it become less of a deal as
well, but just to be safe we cover the base.

be used for AcctGatherFilesystemType.

Conflicts:
	testsuite/expect/test12.7

Was failing to run watchdog thread to make note of hung threads
and not completion of RPC, which is needed for node ping.
This bug was introduced in commit d87d1b50

look at any other day for -D jobs)

no changes in logic

This improves performance for job arrays

Revert commit 26e77f93
This logic is obviously wrong. Investigate more tomorrow.

Add logic to use hash table for improved performance

to front end nodes.

srun properly interprets a leading "." in the executable name based upon
the working directory of the compute node rather than the submit host.

script that will use it.

Note optional model type specification

The srun, salloc and sbatch man pages were not updated to describe
how to specify gres model types.